Table 4.

Prior MLSFH-MAC and MLSFH survey rounds available for MLSFH-MAC respondents surveyed in 2018

	Women	Men	Total
Number of MLSFH-MAC study participants in 2018	968	658	1626
Proportion of 2018 MLSFH-MAC respondents with linkage to:
2017 MLSFH-MAC survey data	0.95	0.93	0.94
2013 MLSFH-MAC survey data	0.67	0.69	0.67
2012 MLSFH-MAC survey data	0.65	0.69	0.67
2010 MLSFH survey data	0.98	0.99	0.99
2008 MLSFH survey data	0.99	0.99	0.99
2006 MLSFH survey data	0.68	0.76	0.71
2004 MLSFH survey data	0.63	0.69	0.66
2001 MLSFH survey data	0.65	0.59	0.62
1998 MLSFH survey data	0.58	0.60	0.59

Longitudinal information covering 20 years of their life course (ie, 1998 to 2018) is available for 59% of the 2018 MLSFH-MAC respondents, and 10 years of follow-up—covering the period 2008 to 2018—is available for 99% of MLSFH-MAC respondents. The difference in longitudinal data linkages is explained by the fact that the MLSFH expanded its sample to older respondents in 2008, which implied that a subset of current MLSFH-MAC respondents were enrolled in 2008, with the remaining MLSFH-MAC respondents either having been part of the initial 1998 MLSFH sample or having been enrolled as part of MLSFH sample expansions during 2001 to 2006.² Because the 2018 MLSFH-MAC sample includes respondents who reached age 45+ years. Only after 2012, only about two-third of the 2018 sample was surveyed at baseline in 2012.

MLSFH-MAC, Mature Adults Cohort of the Malawi Longitudinal Study of Families and Health.